dsignal.h

用来编写 unix 环境下的守护程序的工具库

#ifndef foodaemonsignalhfoo
#define foodaemonsignalhfoo

/* $Id: dsignal.h 101 2005-11-18 20:39:12Z lennart $ */

/*
 * This file is part of libdaemon.
 *
 * libdaemon is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * libdaemon is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with libdaemon; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 */

#ifdef __cplusplus
extern "C" {
#endif

/** \file
 *
 * Contains the API for serializing signals to a pipe for
 * usage with select() or poll().
 *
 * You should register all signals you
 * wish to handle with select() in your main loop with
 * daemon_signal_init() or daemon_signal_install(). After that you
 * should sleep on the file descriptor returned by daemon_signal_fd()
 * and get the next signal recieved with daemon_signal_next(). You
 * should call daemon_signal_done() before exiting.
 */

/** Installs signal handlers for the specified signals
 * @param s, ... The signals to install handlers for. The list should be terminated by 0
 * @return zero on success, nonzero on failure
 */
int daemon_signal_init(int s, ...);

/** Install a  signal handler for the specified signal
 * @param s The signalto install handler for
 * @return zero onsuccess,nonzero on failure
 */
int daemon_signal_install(int s);

/** Free resources of signal handling, should be called before daemon exit
 */
void daemon_signal_done(void);

/** Return the next signal recieved. This function will not
 * block. Instead it returns 0 if no signal is queued.
 * @return The next queued signal if one is queued, zero if none is
 * queued, negative on failure.
 */
int daemon_signal_next(void);

/** Return the file descriptor the daemon should select() on for
 * reading. Whenever the descriptor is ready you should call
 * daemon_signal_next() to get the next signal queued.
 * @return The file descriptor or negative on failure
 */
int daemon_signal_fd(void);

#ifdef __cplusplus
}
#endif

#endif